fdd5aec172
This refactors and improves the `#eval` command, introducing some new
features.
* Now evaluated results can be represented using `ToExpr` and pretty
printing. This means **hoverable output**. If `ToExpr` fails, it then
tries `Repr` and then `ToString`. The `eval.pp` option controls whether
or not to try `ToExpr`.
* There is now **auto-derivation** of `Repr` instances, enabled with the
`pp.derive.repr` option (default to **true**). For example:
```lean
inductive Baz
| a | b
#eval Baz.a
-- Baz.a
```
It simply does `deriving instance Repr for Baz` when there's no way to
represent `Baz`. If core Lean gets `ToExpr` derive handlers, they could
be used here as well.
* The option `eval.type` controls whether or not to include the type in
the output. For now the default is false.
* Now things like `#eval do return 2` work. It tries using
`CommandElabM`, `TermElabM`, or `IO` when the monad is unknown.
* Now there is no longer `Lean.Eval` or `Lean.MetaEval`. These each used
to be responsible for both adapting monads and printing results. The
concerns have been split into two. (1) The `MonadEval` class is
responsible for adapting monads for evaluation (it is similar to
`MonadLift`, but instances are allowed to use default data when
initializing state) and (2) finding a way to represent results is
handled separately.
* Error messages about failed instance synthesis are now more precise.
Once it detects that a `MonadEval` class applies, then the error message
will be specific about missing `ToExpr`/`Repr`/`ToString` instances.
* Fixes a bug where `Repr`/`ToString` instances can't be found by
unfolding types "under the monad". For example, this works now:
```lean
def Foo := List Nat
def Foo.mk (l : List Nat) : Foo := l
#eval show Lean.CoreM Foo from do return Foo.mk [1,2,3]
```
* Elaboration errors now abort evaluation. This eliminates some
not-so-relevant error messages.
* Now evaluating a value of type `m Unit` never prints a blank message.
* Fixes bugs where evaluating `MetaM` and `CoreM` wouldn't collect log
messages.
The `run_cmd`, `run_elab`, and `run_meta` commands are now frontends for
`#eval`.
159 lines
3.5 KiB
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159 lines
3.5 KiB
Text
def tstGetLine (str : String) : IO Unit := do
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let path := "tmp_file";
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IO.FS.withFile path IO.FS.Mode.write $ λ (h : IO.FS.Handle) =>
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h.putStrLn str;
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IO.FS.withFile path IO.FS.Mode.read $ λ (h : IO.FS.Handle) => do
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let str' ← h.getLine;
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IO.println str.length;
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IO.println str'.length;
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IO.print str';
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unless (str'.length == str.length + 1) do
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throw (IO.userError ("unexpected length: " ++ toString str'.trim.length));
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unless (str'.trim == str) do
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throw (IO.userError ("unexpected result: " ++ str'))
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def tstGetLine2 (str1 str2 : String) : IO Unit := do
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let path := "tmp_file";
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IO.FS.withFile path IO.FS.Mode.write $ λ (h : IO.FS.Handle) => do {
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h.putStrLn str1; h.putStr str2
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};
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IO.FS.withFile path IO.FS.Mode.read $ λ (h : IO.FS.Handle) => do
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let str1' ← h.getLine;
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let str2' ← h.getLine;
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unless (str1'.length == str1.length + 1) do
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throw (IO.userError ("unexpected length: " ++ toString str1'.trim.length));
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unless (str1'.trim == str1) do
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throw (IO.userError ("unexpected result: " ++ str1'));
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unless (str2'.length == str2.length) do
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throw (IO.userError ("unexpected length: " ++ toString str2'.trim.length));
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unless (str2'.trim == str2) do
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throw (IO.userError ("unexpected result: " ++ str2'))
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def tstGetLine3 (str : String) : IO Unit := do
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let path := "tmp_file";
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IO.FS.withFile path IO.FS.Mode.write $ λ (h : IO.FS.Handle) => do {
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h.putStrLn str
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};
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IO.FS.withFile path IO.FS.Mode.read $ λ (h : IO.FS.Handle) => do
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(h.getLine >>= IO.println);
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(h.getLine >>= IO.println);
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(h.getLine >>= IO.println);
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IO.print "done";
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pure ()
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/--
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info: abc
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done
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-/
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#guard_msgs in
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#eval tstGetLine3 "abc"
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/--
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info: 40
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41
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αααααααααααααααααααααααααααααααααααααααα
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'α' 40)
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/--
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info: 1
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2
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a
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-/
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#guard_msgs in
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#eval tstGetLine "a"
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/--
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info: 0
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1
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-/
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#guard_msgs in
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#eval tstGetLine ""
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/--
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info: 20
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21
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αααααααααααααααααααα
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'α' 20)
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/--
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info: 61
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62
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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'a' 61)
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/--
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info: 61
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62
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ααααααααααααααααααααααααααααααααααααααααααααααααααααααααααααα
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'α' 61)
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/--
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info: 62
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63
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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'a' 62)
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/--
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info: 63
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64
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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'a' 63)
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/--
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info: 64
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65
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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'a' 64)
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/--
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info: 65
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66
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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'a' 65)
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/--
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info: 66
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67
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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'a' 66)
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/--
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info: 128
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129
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aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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-/
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#guard_msgs in
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#eval tstGetLine ("".pushn 'a' 128)
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#guard_msgs in
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#eval tstGetLine2 ("".pushn 'α' 20) ("".pushn 'β' 20)
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#guard_msgs in
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#eval tstGetLine2 ("".pushn 'α' 40) ("".pushn 'β' 40)
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#guard_msgs in
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#eval tstGetLine2 ("".pushn 'a' 61) ("".pushn 'b' 61)
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#guard_msgs in
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#eval tstGetLine2 ("".pushn 'a' 61) ("".pushn 'b' 62)
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